if (stack.length === 0 && cur === 0) {
* 时间复杂度: O(d*(n+k)) d:位数 k:进制(10) 空间复杂度: O(n+k) 稳定: ✓，这一点在同城约会中也有详细论述
Each puzzle features 16 words and each grouping of words is split into four categories. These sets could comprise of anything from book titles, software, country names, etc. Even though multiple words will seem like they fit together, there's only one correct answer.，更多细节参见旺商聊官方下载
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